Question

我有一个函数，我通过它调用我的REST API。我需要在请求中传递图像。我如何实现这一目标？

代表：

public int Save(Image image)
{
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
    req.Method = "POST";
    HttpWebResponse response = (HttpWebResponse)req.GetResponse();
}

在这里，我如何传递我的图像＆＃39;根据我的要求＆＃39; req＆＃39;？

Answer 1

尝试使用以下内容：

req.ContentType = "multipart/form-data";

using (var ms = new MemoryStream())
{
    image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); //if it is jpeg
    string encoded = Convert.ToBase64String(ms.ToArray());
    byte[] reqData = Encoding.UTF8.GetBytes(encoded);
    using (var stream = req.GetRequestStream())
    {
        stream.Write(reqData, 0, reqData.Length);
    }
}

Answer 2

你可以在客户端做这样的事情：

HttpClient client = new HttpClient();
var imageStream = File.OpenRead(@"C:\p1.jpg");
var content = new StreamContent(imageStream);
content.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg");
var response = await client.PostAsync("URL", content);

您可以从NugetPackage中获取 HttpClient Microsoft.Net.Http

在REST API端（接收端），您可以从Request.Content对象中获取它，如下所示：

public void Post()
{
            using (var fileStream = File.Create("C:\\NewFile.jpg"))
            {
                using (MemoryStream tempStream = new MemoryStream())
                {
                    var task = this.Request.Content.CopyToAsync(tempStream);
                    task.Wait();

                    tempStream.Seek(0, SeekOrigin.Begin);
                    tempStream.CopyTo(fileStream);
                    tempStream.Close();
                }

            }
 }

REST API将图像发送到请求

2 个答案: